The 105 mm howitzer motor carriage M7 was an American self-propelled artillery vehicle produced during World War II.

During the early stages of World War II, US Army observers realized that they would need a self-propelled artillery vehicle with sufficient firepower to support armored operations.

[6] The pilot vehicles used the M3 chassis with an open-topped superstructure, mounting an M2A1 105 mm howitzer, with a machine-gun added after trials.

They proved to be reliable weapons, continuing to see front-line service in the US and other armies well past the end of World War II.

[10] Whereas the Sexton – a rival self-propelled gun developed in Canada - featured the standard British QF 25-pounder (on an M3 or M4 chassis).

From early 1944 it was used in the South West Pacific theater, by the US Sixth Army in the later stages of the campaign in New Guinea and surrounding islands.